Problems with MIL watching my kids

I just had my baby last week and I also have an 18 month old. My husband and I are VERY close to his parents. I LOVE my mother in law but I just don’t trust her with my kids. Not that I think she’s going to abuse them or anything just that she’s SUPER clumsy and is not careful. She’s dropped newborns down the stairs, not paid attention where she’s walking and smacked there heads on walls/counters, has come very close to tripping while walking around with them. She’s obviously not intentionally hurting them but she always ends up doing something to hurt them. (Some of these have happened a few times with my 18 month old but she’s done this stuff with other people kids) I don’t feel comfortable leaving my kids with her because of this and I’ve explained this to my husband and he knows it’s true but thinks I’m just being mean. I really do love her and wish I felt comfortable leaving my kids with her but I just don’t and it’s not a risk I’m willing to take anymore.

She’s pretty much been the only person who’s watched my 18 month old because she would get mad at me when I told her I wanted someone else to watch him and it’d end up causing a bunch of drama so I’d just let her. But now that my other son is here I’m not okay with it anymore. I guess I’m wondering how I go about this? I have people who I trust completely to watch my kids but she gets offended and I don’t want to ruin our relationship especially since my husband and I are so close to her and my FIL. Any advice on how to go about this?